code: def test_coverage_parameter(self):
      aug = nas.LoudnessAug(coverage=0)
      aug = nas.LoudnessAug(coverage=0.5)
      aug = nas.LoudnessAug(coverage=1)
  
      with self.assertRaises(ValueError) as context:
          aug = nas.LoudnessAug(coverage=-1)
      self.assertTrue(
          "Coverage value should be between than 0 and 1 while"
          in str(context.exception)
      )
  
      with self.assertRaises(ValueError) as context:
          aug = nas.LoudnessAug(coverage=1.1)
      self.assertTrue(
          "Coverage value should be between than 0 and 1 while"
          in str(context.exception)
      )
  
file_path: nlpaug/test/augmenter/spectrogram/test_spectrogram.py
imports: import unittest
  import os
  from dotenv import load_dotenv
  from nlpaug.util import AudioLoader
  import nlpaug.augmenter.spectrogram
label_desc: Use image node_id 4 for calling the TestFrequencyMasking obj's underlying member method code with example usage: obj.test_coverage_parameter() without return types